Hi, Muhammad.
Based on your description, did you check the netsh proxy via the netsh winhttp show proxy command?
Just to confirm, It should show Direct Access (No proxy server).
Please run winrm quickconfig to see if it returns the following information:
WinRM service is already running on this machine.
WinRM is not set up to allow remote access to this machine for management.
If so, follow the guide to make the changes and have WinRM configured automatically.
And then check if EMS can work fine.
Besides, is there any anti-virus software installed on your Exchange server?
If there is, please uninstall them and see if the problem persists.
If the suggestions above didn’t help with your problem, please answer the following questions:
1.Which version of Exchange server are you using? Is it a brand new install?
2.Are there other Exchange Servers or DAGs in your environment? Can EMS be opened correctly on other servers?